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Can create Subgrid Type more than one column

I try to create subgrid column with XML file.
It's OK if only one column like
...
<cell>HCT01</cell>
<cell type="sub_row_grid">subFunction.xml</cell>
<cell>1234</cell>
...

And I create Subgrid column more like this
...
<cell>HCT01</cell>
<cell type="sub_row_grid">subFunction.xml</cell>
<cell type="sub_row_grid">subFunction2.xml</cell>
<cell>1234</cell>
...

Both Subgrid show data from subFunction2.xml not show from subFunction.xml

Why?

Unfortunately dhtmlxGrid doesn't support more than one sub_row_grid column